Extensionclass

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- Add support for Python 3.10 and 3.11 (as of alpha 3).

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- Create wheels for Linux (2010, 2014 and aarch) and MacOS.

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- Drop support for Python 3.4.

- Add support for Python 3.8 and 3.9.

- Fix accessing ``__parent__`` when it is defined as a class attribute
that is ``None`` (e.g., in subclasses of
``zope.conatiner.contained.Contained``). See `issue 24
<https://github.com/zopefoundation/ExtensionClass/issues/24>`_.

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- Fail if C extensions couldn't be compiled on compatible platforms.

- Add Appveyor configuration to automate building Windows eggs

- Add support for Python 3.7.

- Fix getting attributes that are data descriptors in the Python
implementation.

- Reach and automatically maintain 100% test coverage.

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- Drop support for Python 3.3.

- Remove unused C macro from ``ExtensionClass.h``.

- Fix C compilation under Windows.

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- Fix problems with computed attribute and property wrapping.